Recommended Wire Sections; Field Control Wiring; Power Supply - Carrier 30RQ 039 Series Installation, Operation And Maintenance Instructions

11.4 - Recommended wire sections

Wire sizing is the responsibility of the installer, and depends
on the characteristics and regulations applicable to each
installation site. The following is only to be used as a guide-
line, and does not make Carrier in any way liable. After
wire sizing has been completed, using the certified dimen-
sional drawing, the installer must ensure easy connection
and define any modifications necessary on site.
The connections provided as standard for the field-supplied
power entry cables to the general disconnect/isolator switch
are designed for the number and type of wires, listed in the
table below.
The calculations are based on the maximum machine cur-
rent (see electrical data tables), and standard installation
practises, in accordance with IEC 60364, table 52C have
been applied (30RQS units are installed outside):
• No. 17: suspended aerial lines,
• No. 61: buried conduit with a derating coefficient of 20.
The calculation is based on PVC or XLPE insulated cables
with copper core. A maximum ambient temperature of
46°C has been taken into consideration. The given wire
length limits the voltage drop to < 5% (length L in metres
- see table below).
ImpOrTANT: Before connection of the main power
cables (L1 - L2 - L3) on the terminal block, it is impera-
tive to check the correct order of the 3 phases before
pro-ceeding to the connection on the main disconnect/
isolator switch.
power cable entry
The power cables can enter the control box from below or
from the side of the unit, at the bottom of the angle iron.
Pre-punched holes facilitate the entry. Refer to the certified
dimensional drawing for the unit. A removable aluminium
plate below the control box allows introduction of the cables.
Minimum and maximum connectable wire sections (per phase) for 30RQS units
30RQS/ Disconnect switch
RQSY
Max. connection capacity Minimum calculated section
Section, mm²
039 1 x 95
045 1 x 95
050 1 x 95
060 1 x 95
070 1 x 95
078 1 x 95
080 1 x 95
090 1 x 95
100 1 x 95
120 1 x 95
140 1 x 185
1 x 185
160
Note: Power supply cable section (see the wiring diagrams supplied with the unit)
26
Connectable wire
Section, mm² Max. length, m
1 x 16 165
1 x 16 165
1 x 16 165
1 x 25 210
1 x 35 220
1 x 35 220
1 x 35 220
1 x 35 220
1 x 70 280
1 x 70 280
1 x 95 305
1 x 120 320

11.5 - field control wiring

IMPORTANT: field connection of interface circuits may
lead to safety risks: any control box modification must
maintain equipment conformity with local regulations.
Precautions must be taken to prevent accidental electrical
contact between circuits supplied by different sources:
• The routing selection and/or conductor insulation
characteristics must ensure dual electric insulation.
• In case of accidental disconnection, conductor fixing
between different conductors and/or in the control
box prevents any contact between the conductor ends
and an active energised part.
Refer to the 30RB/30RQ 017-160 Pro-Dialog+ Controls
IOM and the certified wiring diagram supplied with the
unit for the field control wiring of the following features:
• Water heat exchanger pump interlock (mandatory)
• Remote on/off switch
• Demand limit external switch
• Remote dual set point
• Alarm, alert and operation report
• Heating/cooling selection

11.6 - power supply

ATTENTION: After the unit has been commissioned, the
power supply must only be disconnected for quick main-
tenance operations (one day maximum). for longer main-
tenance operations or when the unit is taken out of service
and stored (e.g. during the winter or if the unit does not
need to generate cooling) the power supply must be main-
tained to ensure supply to the heaters (compressor oil
crankcase heaters, unit frost protection).
After all possible options have been connected, the trans-
former ensures the availability of a usable 24 VA or 1 A
power reserve for the control circuit on site.
Maximum calculated section
Wire type Section, mm²
XLPE Cu 1 x 25
XLPE Cu 1 x 25
XLPE Cu 1 x 25
XLPE Cu 1 x 35
XLPE Cu 1 x 50
XLPE Cu 1 x 70
XLPE Cu 1 x 70
XLPE Cu 1 x 70
XLPE Cu 1 x 95
XLPE Cu 1 x 95
XLPE Cu 1 x 185
XLPE Cu 1 x 185
Max. length, m Wire type
300 PVC Cu
300 PVC Cu
300 PVC Cu
305 PVC Cu
350 PVC Cu
380 PVC Cu
380 PVC Cu
380 PVC Cu
410 PVC Cu
410 PVC Cu
465 PVC Cu
465 PVC Cu